Pre-prep tip: You'll have a helper but it will help her to control the patient if you can find something stretchy to confine her wings to her body as well as her legs and feet. If you can find a small head cover so she isn't watching you, she will also be much calmer.
If at any time during this procedure she begins to struggle, stop what you're doing and simply make a "shhing" sound and talk softly to her until she quiets. Depending on her temperament, she could make a sporadic move to get loose, but she should settle right back down if you talk calmly and "shh" her. Many chickens can endure any amount of painful procedure and not move a muscle. I've had both types.
You will do fine, and I know this will help her get better.
As for feeding after the procedure, about an hour later, give her more warm Gatoraid and make it available if she wants more. I would withhold food until tomorrow, and just give her soft stuff and fluids. Avoid anything hard and scratchy for about three days.
Monitor crop consistency each morning. You may need to complete the miconzole treatment to get rid of all the yeast spores in her system.
